I've searched around and found nothing comprehensive on the subject...

What are your thoughts on internal cable routing, and how should it be done?
Full housing in a copper tube?
Stops into the frame with bare cable inside, or cable ran through copper tube?
Discourage at all costs?
Should it be limited to brakes and not used for derailleurs?

Not too late to quit while im ahead, seems like a few of you are bummed on it...

Thank you for letting me glean some knowledge!